Wallace was taken into custody after 4 a.m. Sunday by Torrance police and SWAT officers at 4th Street and Western Avenue in Los Angeles, police said. He is being held without bail, jail records show.

“At this time, we believe we have the sole shooter in this incident,” Irvine said at a Monday afternoon news conference at Police Department headquarters.

She said Wallace was inside the bowling alley before midnight Friday when a fight between two people broke out. It grew into a brawl with 10 to 15 people, and at some point, he took out a handgun from his pocket and began shooting, she said.

Torrance Police Chief Eve Irvine announces the arrest of 47-year-old Reginald Wallace (pictured) during a press conference in Torrance on Monday, Jan. 7, 2019. Wallace is in custody for the killing of three men and wounding of four others during a shooting Friday at Gable House Bowl. (Photo by Scott Varley, Daily Breeze/SCNG)

Torrance Police Chief Eve Irvine leaves a press confence announcing the arrest of 47-year-old Reginald Wallace (pictured) during a press conference in Torrance on Monday, Jan. 7, 2019. Wallace is in custody for the killing of three men and wounding of four others during a shooting Friday at Gable House Bowl. (Photo by Scott Varley, Daily Breeze/SCNG)

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Torrance Police Chief Eve Irvine announces the arrest of 47-year-old Reginald Wallace during a press conference in Torrance on Monday, Jan. 7, 2019. Wallace is in custody for the killing of three men and wounding of four others during a shooting Friday at Gable House Bowl. (Photo by Scott Varley, Daily Breeze/SCNG)

Torrance Police Chief Eve Irvine announces the arrest of 47-year-old Reginald Wallace during a press conference in Torrance on Monday, Jan. 7, 2019. Wallace is in custody for the killing of three men and wounding of four others during a shooting Friday at Gable House Bowl. (Photo by Scott Varley, Daily Breeze/SCNG)

Surrounded by fellow officers, Torrance Police Chief Eve Irvine announces the arrest of 47-year-old Reginald Wallace (pictured at left) during a press conference in Torrance on Monday, Jan. 7, 2019. Wallace is in custody for the killing of three men and wounding of four others during a shooting Friday at Gable House Bowl. (Photo by Scott Varley, Daily Breeze/SCNG)

A booking mug shot of 47-year-old Reginald Wallace in Torrance on Monday, Jan. 7, 2019. Wallace is in custody for the killing of three men and wounding of four others during a shooting Friday at Gable House Bowl. (Photo by Scott Varley, Daily Breeze/SCNG)

Torrance police officers early Saturday investigate a Friday night shooting at the Gable House Bowl in Torrance. (Photo by Scott Varley, Daily Breeze/SCNG)

Torrance police officers investigate a shooting at the Gable House Bowl in Torrance on Saturday, Jan. 5, 2019. Early reports are that three people have been killed and four others injured in the shooting that followed a fight at the bowling alley. The shooting happened (Photo by Scott Varley, Daily Breeze/SCNG)

People gather outside of the Gable House Bowl following a shooting in Torrance on Saturday, Jan. 5, 2019. Early reports are that three people have been killed and four others injured in the shooting that followed a fight at the bowling alley. (Photo by Scott Varley, Daily Breeze/SCNG)

Torrance police officers investigate a shooting at the Gable House Bowl in Torrance on Saturday, Jan. 5, 2019. Early reports are that three people have been killed and four others injured in the shooting that followed a fight at the bowling alley. (Photo by Scott Varley, Daily Breeze/SCNG)

It was unknown whether the gunman was a part of the fight or knew anyone involved, Irvine said. She did not share a possible motive or what the initial altercation was over.

“From the video, it’s hard to tell if he had intentions of who he wished to shoot,” Irvine said, describing the scene as “complete chaos.”

“When he pulled out the handgun, the minute people started hearing shots, even more chaos erupted and people were trying to run out of the bowling alley,” she said.

Robert Earl Meekins Jr. and Astin Kyle Edwards, both 28, and Michael Di’Shawn Radford, 20, were killed in the shooting. Two others were taken to a hospital and two more sought medical treatment on their own, police said.

The brawl was captured on cellphone video and widely shared on social media.

Distraught relatives waited Saturday morning outside the bowling alley for hours on details from authorities of their loved ones’ fates. They described Meekins and Edwards as best friends.

Relatives of the men who were killed said they all jumped in to break up the fight.

Meekins leaves behind a 5-year-old son, and Radford, an 8-month-old baby, family members said.

Irvine declined to say whether police found the handgun, what caliber it was or how Wallace obtained it. He was released from prison in 2017 after serving 17 years for a conviction for an assault with a deadly weapon with a firearm, police said.

Court records show Wallace was acquitted of attempted murder in the December 1998 case and sentenced to 21 years behind bars. The year before, he pleaded guilty to possessing a firearm in a school zone and was sentenced to two years in prison.

Megan Barnes covers crime and public safety for the Press-Telegram. She was previously a city reporter at the Daily Breeze, where she covered the South Bay beach cities and the Palos Verdes Peninsula. Before that, she was a freelancer writing about LGBT news and her hometown of San Pedro, where she probably made your latte at Starbucks. She loves iced Americanos and Radiohead and finally got to see them live on the A Moon Shaped Pool tour. It was magical.